Improvement



snnunnn. JONES, or inner ALBANY, NEW'YonK,

iMPRGVEMENT IN LEATHER-TRlMMlNG MACHINES.

' Specification forming part of Letters Patent No. 140,631, dated July 8, 1873; application filed August 26, 1572. v I

To all u hom 'ii'llldjj concern:

Be it known that I, SAMUEL H. JONES, of

East Albany, county of ltensselaer, State of New'York, haveinvented certain Improvements in Apparatus for Trimming-Leather, of

which the following is s specification:

My invention relates to certain improvements in apparatus for trimming leather; and consists, in one part, of combining, with a vertical reciprocating chisel attached to the needle-bar, a curved or partially curved cutting-edge in such a manner that the said cuttingedg'e will operate to form n series of cuts, which will be of form other than straight-line cuts, the object of this part of my invention being to cfleot 2. series of cuts when the stitches are being taken, each of which will cc distinct, and a succession of cuts will efl'ect a continuous parting of the wastefrom the body, in which, by the curved form of the curved cutting-edge of the chisel, each cut, when effected, will have either its front end,

' or its front or back ends, carved on the waste,

so that in operating with curves or scallops the trimmed edge of the body will present a cleaircnt appearance. Another part of my invention consists in the combination of aside sleeve and set-screw with the chisel, and an annular tenon made on the end of the needlebar, in such ninanner that the said sleeve and set-screw will be capable ofsecuring the chisel to the needle-bar, and also capable of a lfording' a vertical adjustment of thepeedle us it becomes'worn by use. Another part consists in thecomuinotio'n of an elastic sliding supporting-piece with the throatpiece in such it manner as to give afirm support to the materie-l on/t-he waste side when the chisel is ening in iii lateral direction as the cutting-edge of the chisel passes in the crack of the joint-v ure between the said elastic support and the solid portion of the throat-piece, the object of this part'of my invention being to cause the chisel to actwit 2 the edge of the solid portion of the throat-piece somewhat after the manncr'of shears, in cutting down past the edge or" the said. solid portion of the throat piece s specs will he effected sufiicicnt to adnut the chisel to pass downto its full dip.

' {Io enable others skilledin the art to make tering the material, and he capable of yield and use my invention, I will proceed to describe it in reference to the accompanying drawings and the letters of reference marked. thereon, the same letters indicating like parts.

In the drawings, Figure 1 represents a perspective view of a. sewing-machine embodying the improvements in this invention. Fig. 2' is a sectional elevation of the'ueedlebar and throat-piece embodying the invention. :Fig'.

3 is a vertical view of the throat-piece as im-.-

proved. Fig. 4 is a cross-sectional view of the same. Fig. 5 is an end view of the cutter. Fig. 6 is a vertical view of the throat-piece with part of the improvements applied in a.

modified form. Fig. 7 is a cross-sectional viewof the same. Fig. 8 is a view of a modified form of cutting-edge. In the drawings, Arepreseuts the table or bed'of the machine. 0 is the usual arm, su p-.

portingthe upper working mechanism of the machine. D is the needle-bar. E is the presser-foot--all of which parts, or their modificatious,-form no part of my invention, and all are too well known to require particular description. In my invention I form,-on the lower end of the needlebar D, the annular 'ting-edge, and thus secure a longer use of the chisel. Made with the said sleeve is the cuttor or trimming chisel G, which cutter is located on the side of the needle-bar opposite/the presser-foot E, as shown in Fig. 1. The said cutter, for ordinary leather-work, is made of such a length below the needlebar as to strikef the material operated with a little before theneedlc reaches its lowest dip, so that the said cutter will have a length of stroke after touching the top surface of the material of about one-eighth of one inch, more or less.- The cutting-edge of the said chisel is made with a. straight line of edge in a. horizontal direction, and with a greater or less line of curve in alatcral direction on' the waste side of the needle, as shown in Figs.

2 lamest-1 5 and 8. By this form of edge the trimmed edge of bodyside will be made to present a clean-cut appearance, which cannot be had with achisel having a lateral straight line of cutting-edge.

The throat-piece B is made with the usual form, and is provided with an elastic supporting piece,1l, fitting into the recess 0 made in the said throat-piece, so as to be flush with its top surface and present an even surface with the thr0at-piece proper, over which the material'is to pass. "The elastic supportin y piece 11 is made about one-sixteenth of an inch, more or less, shorter than the length of the recess 0, and is capable of being slid back, and is held in place by any suitable holding screw or pin, 0, which is secured with the piece H, and works in the slotted hole made from the recess through the throat-piece. The supporting-piece H is made elastic by any suitable spring, S, arranged to work against the throatpiece proper and the said sliding piece. by the holding screw or pin 0, in such a manner that the-end of the supporting-piece H toward the needle-hole n will press against the end wall of the throat-piece, as shown in Figs. 2, 3, and 4.

As the form and mode of applying the said spring to render the said supportingpiece elastic can be varied, I do not confine myself to any particular form or mode of application. The edge of the solid portion of the throatpiece which contacts with the elastic support, and also the contiguous edge of the said elastic support, are both made to conform with the respective forms of the sides of the chisel they are to face, so that when the elastic sup port is pressed against the edge of the said solid portion of the throat'piece the jointure between the same will present but a slight line of opening, as shown in Figs. 3 and 6,, into which the chisel will enter, and the chisel striking past the said edge of the throat-piece will, with it, act as a shear to cause the cut to be made clean, which would effect substantially the same results. I

In the throat-piece, at the termination of the recess a, is made the perforation ac,*which will permit the end of the cutter or chisel G to pass through when the needledrar is east down. The termination of the said recess a and the perforation w is located in such a manner as to be directly beneath the cutter or chisel G, so that when the cutter descends it and pass down through the perforationm, as

shown by dotted lines H in Fig. 2.

When the several parts of this invention.

are arran ged as above described, therpeterial to be operated upon is placed on the table A and the machine is operated in the u'sualman ner, and when the needle is thrust throughthe material, as shown in Fig. 2, the edge of the cutter G will strike the material at a little distance from the stitching, and pass through the same and enter the perforation m, crowding the supporting-piece H back, andthe said sliding supportingpiece, acting with thesolid portion of the throat-piece, acts to give a permanent support for the material while being cut; and in yielding readily to the point of the cutter will admit the said cutter to pass clearthrough the material to etl'ect the cutting in a clear and even manner, without any appearance of being ragged. I

If desired, the throat-piece can be construct ed with a sliding supporting piece, H ar ranged as shown in Figs. 6 and 7, which would act substantially the same as theslidiug piece H, in Figs. 2, 3. and 4.

Having described my invention, what .I

elainn and desire to secureby Letters Patent, is' I 1. The combination of sliding plate Hand spring S with the throat-piece, substantially as and for the purpose set forth.

cutter G and needle-bar D with the throatpiece B provided with the sliding piece H and sprf-n g S, substantially as and for the purpose set forth. .7

SAMUEL II. JONES.

Witnesses Cons. VAN DERGE, ALEX. SELKIRK. 

